Theoretical analysis of start-up power in helium pulsating heat pipe

26th International Cryogenic Engineering Conference & International Cryogenic Materials Conference 2016

材料科学;物理学

Li, Monan^1,2 ; Huang, Rongjin^1 ; Xu, Dong^1 ; Li, Laifeng^1

Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, China^1

University of Chinese Academy of Sciences, Beijing, China^2

关键词: Different speed;    Exciting forces;    Inclination angles;    Oscillating motion;    Pressure differences;    Pulsating heat pipe;    Temperature and pressures;    Vertical positions;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/171/1/012102/pdf
DOI  :  10.1088/1757-899X/171/1/012102

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

An analytical model for one-turn helium pulsating heat pipes (PHPs) with single liquid slug and vapor plug is established in present study. When an additional heat power takes place in the evaporating section, temperature and pressure will increase. The pressure wave travels through vapor and liquid phases at different speed, producing a pressure difference in the system, which acts as an exciting force to start up the oscillating motion. Results show that the start-up power of helium PHP is related to the filling ratio. The start-up power increases with the filling ration. However, there exist an upper limit. Furthermore, the start-up power also depends on the inclination angle of PHP. When the inclination angle increases, the heat input needed to start up the oscillating motion decreases. But for one-turn helium PHP, it can not be started up when the inclination angle is up to 90°, equalling to horizontal position,. While the inclination angle ranges between 0° (vertical position) and 75°, it can operate successfully.